sudo: sanitize filter values
Resolves:
https://fedorahosted.org/sssd/ticket/2613
Reviewed-by: Pavel Reichl <preichl@redhat.com>
(cherry picked from commit c526cd124515cc2d44a413dcbfd4a74ddb490150)
(cherry picked from commit 2fb2a267d0d15cce84b0ccea7e088a4b580e42fb)